Ultrahigh Capacity Due to Multi‐Electron Conversion Reaction in Reduced Graphene Oxide‐Wrapped MoO2 Porous Nanobelts. Issue 20 (23rd January 2015)

• Record Type: Journal Article
• Authors: Tang, Wei; Peng, Cheng Xin; Nai, Chang Tai; Su, Jie; Liu, Yan Peng; Reddy, M. V. Venkatashamy; Lin, Ming; Loh, Kian Ping
• Is Part Of: Small. Volume 11:Issue 20(2015)
• Page Start: 2446
• Page End: 2453
• Publication Date: 2015-01-23
• Subjects: Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201403018
• Languages: English
• ISSNs: 1613-6810

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Multivalent transition metal oxides (MO<italic>_x</italic>) containing redox centers which can theoretically accept more than one electron have been suggested as promising anode materials for high‐performance lithium ion batteries (LIBs). The Li‐storage mechanism of these oxides is suggested to involve an unusual conversion reaction leading to the formation of metallic nanograins and Li₂O; however, a full‐scale conversion reaction is seldom observed in molybdenum dioxide (MoO₂) at room temperature due to slow kinetics. Herein, a full‐scale multi‐electron conversion reaction, leading to a high reversible capacity (974 mA h g⁻¹ charging capacity at 60 mA g⁻¹) in LIBs, is realized in a hybrid consisting of reduced graphene oxide (rGO) sheet‐wrapped MoO₂ porous nanobelts (rGO/MoO₂ NBs). The rGO wrapping layers stabilize the nanophase transition in MoO₂ and alleviate volume swing effects during lithiation/delithiation processes. This enables the hybrid to exhibit great cycle stability (tested to around 1900 cycles) and ultrafast rate capability (tested up to 50 A g⁻¹).</p> </abstract>